%I #5 Mar 30 2012 18:35:21
%S 1,1,2,2,2,4,5,7,13,19,36,56,102,193,350,642,1131,2191,3975,7480,
%T 14540,27004,51067,95327,174777,335535,658017,1266162,2485494,4793475,
%U 8521778,16519017,31580551,62245705,116080359,229064578,440510030,848388496
%N Number of products of distinct primes <= p(n) equal to 1 (mod p(n)).
%K nonn
%O 1,3
%A _David W. Wilson_